The world's first commercially viable quantum computer was unveiled and demonstrated today in Silicon Valley by D-Wave Systems, Inc., a privately-held Canadian firm headquartered near Vancouver. Quantum computing offers the potential to create value in areas where problems or requirements exceed the capability of digital computing, the company said. But D-Wave explains that its new device is intended as a complement to conventional computers, to augment existing machines and their market, not as a replacement for them.

That applies to any form of communication. What the data contains is irrelevant if you can interfere with the transmission.

No, the greatest trick is to allow the communication to go on apparently untouched and safe, while actually eavesdropping. That is impossible with quantum technology, because it's not possible (at least for now) to reproduce the same data stream once you've touched it.